Photographed during an International League of Conservation Voters expedition, an egret wades through a wetland near a barrier fence in southern Texas in February 2009.

Plagued by droughts in the past decade, the U.S.-Mexico border is expected to see even more, and worse, dry spells in the future, according to Krista Schlyer, leader of the Rapid Assessment Visual Expedition (RAVE) project.

Animals will likely try to escape droughts by moving north. For many of them, the new border wall wall will be a problem, Schyler said.